.father{
    width: 3rem;
    height: 2rem;
    border: 1px solid #000;
    background-image: linear-gradient(to bottom, skyblue 0%,pink 100%);
    // 子代 >.son
    .son{
        line-height: 2rem;
        height: 50%;
        text-align: center;
        a{
            color: pink;
            text-decoration: none;
            font-size: 0.3rem;
            &:hover{
                color: purple;
                font-size: 0.6rem;
            }
        }
    }
}